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The Vortec engines were notorious for those kind of problems. The problem will be under the upper-intake manifold, and the fuel injector assembly will either have a cracked plastic fuel line running out to one or more of the fuel injectors, or the fuel pressure regulator that is located on the end of the fuel injector assembly is faulty or it has detached from the fuel injector assembly. Either way the lower intake manifold will be flooded with fuel anytime that the fuel pump runs.

There were two types made, the first type had fuel lines that connected to the lower intake manifold, and then from the metal fittings the fuel line turns into plastic and runs inside the lower intake manifold and under the upper-intake manifold where it runs over to the fuel injector assembly, and this type can really flood out an engine when it becomes faulty.

The second type had metal fuel lines running over the upper intake manifold and they connected to the top of the fuel injector assembly, however, under the upper-intake manifold there are still plastic lines to the fuel injectors and also the fuel pressure regulator that could be faulty and cause the engine to severely flood.

The upper-intake manifold is not that difficult to remove, and after you remove the upper-intake manifold then (replace the fuel lines to the fuel injector assembly if it is the second type) turn the ignition to the "Run" position and when the fuel pump runs you should see where the fuel is leaking/spraying from, and it will most likely be a large high pressure leak from a ruptured plastic fuel line.

the cams are fragile too big a job to describe in full . bet it broke after cam belt change should never use power tools to undo cam pulley bolts all the bolts should be undone only when engine is locked with correct locking kit to avoid strees on cams new bolts should be fitted on re assembly to correct tourqe setting while cams are locked hope this helps you

NOTE
The 3.8L (VIN K) non-supercharged engine uses a two-piece intake
manifold consisting of an upper air plenum which mounts the throttle
body and a lower intake manifold assembly which houses the fuel
injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower
intake manifold. The supercharger serves as the upper manifold.Lower Manifold

NOTE
Two bolts which fasten the lower intake manifold to the cylinder
head are accessible only after the upper intake manifold is removed.
These bolts are located in the right front and left rear corners of the
lower intake manifold. Remove the upper intake manifold to service the
lower intake.The 3.8L (VIN 1) supercharged engine uses a manifold
similar to the 3.8L (VIN K), but the supercharger serves as the upper
manifold.

Disconnect the negative battery cable.

On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.

Remove the lower intake manifold bolts and carefully lift off the manifold.

To install:

Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine

Clean all parts well with degreaser, especially the gasket seal
surfaces on the upper and lower manifold pieces and between the lower
manifold and the cylinder heads..

Install new gaskets to the cylinder heads and new seals to the
engine block. Carefully lower the manifold into place. Apply
thread-locking compound to the bolt threads. Make sure to install the
two hidden bolts in the lower intake manifold. Hand start all bolts,
then torque evenly to 11 ft. lbs. (15 Nm). Follow the toque sequence,
starting in the center, then working outwards in a circle.

Install the remaining components in the reverse order of the removal process.

Upper Intake Manifold (Plenum)

Disconnect the negative battery cable.

On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.

Tag for identification, then remove the right side spark plug wires.

Disconnect the ignition wires from the fuel rail.

Remove the fuel rail. Please see Section 5.

Remove the cable bracket from the intake manifold.

Remove the throttle body.

NOTE
Two bolts which fasten the lower intake manifold to the cylinder
head are accessible are accessible only after the upper intake manifold
is removed. These bolts are located in the right front and left rear
corners of the lower intake manifold.

Remove the upper intake manifold bolts and carefully lift the upper intake manifold from the engine.

Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces.

Install new gaskets to the cylinder heads and new seals to the
engine block. Carefully lower the manifold into place. Make sure to
install the two hidden bolts in the lower intake manifold. Hand start
all bolts, then torque evenly to 89 inch lbs. (10 Nm). Follow the
torque sequence, starting in the center, then working outwards in a
circle.

Install the remaining components in the reverse order of the removal process.

i doubt it is a lifter but it could be. they are of the hydralic type. it is probably one of the cheap plastic motors in the intake manifold. they always go out. a new manifold cost about 900 us.
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